﻿//        Copyright (c) 2009-2010, Semyon A. Chertkov (semyonc@gmail.com)
//        All rights reserved.
//
//        Redistribution and use in source and binary forms, with or without
//        modification, are permitted provided that the following conditions are met:
//            * Redistributions of source code must retain the above copyright
//              notice, this list of conditions and the following disclaimer.
//            * Redistributions in binary form must reproduce the above copyright
//              notice, this list of conditions and the following disclaimer in the
//              documentation and/or other materials provided with the distribution.
//            * Neither the name of author nor the
//              names of its contributors may be used to endorse or promote products
//              derived from this software without specific prior written permission.
//
//        THIS SOFTWARE IS PROVIDED ''AS IS'' AND ANY
//        EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
//        WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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//        DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
//        (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
//        LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
//        ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
//        (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
//        SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

using System;
using System.Collections.Generic;
using System.Text;

using System.Xml;
using System.Xml.XPath;

using DocumentFormat.OpenXml;
using DocumentFormat.OpenXml.Packaging;

namespace DataEngine.XQuery.OpenXML
{
    public static class OpenXMLFactory
    {
        public static XQueryNodeIterator QueryNodes(this OpenXmlPart part, string xquery)
        {
            return QueryNodes(part, xquery, null);
        }

        public static XQueryNodeIterator QueryNodes(this OpenXmlPart part, string xquery, XmlNamespaceManager nsmgr)
        {
            return QueryNodes(part, part.RootElement, xquery, nsmgr);
        }

        public static XQueryNodeIterator QueryNodes(this OpenXmlPart part, OpenXmlElement contextNode, string xquery)
        {
            return QueryNodes(part, part.RootElement, xquery, null);
        }

        public static XQueryNodeIterator QueryNodes(this OpenXmlPart part, OpenXmlElement contextNode, 
            string xquery, XmlNamespaceManager nsmgr)
        {
            NameTable nameTable = new NameTable();
            OpenXmlDocument doc = new OpenXmlDocument(part, nameTable);
            OpenXmlNavigator node = new OpenXmlNavigator(new ElementAdapter(contextNode, new RootAdapter(doc.Part.RootElement, doc)));
            OpenXmlQueryCommand command = new OpenXmlQueryCommand(nameTable);
            if (nsmgr != null)
                command.Context.CopyNamespaces(nsmgr);
            command.ContextItem = node;
            command.CommandText = xquery;
            return BufferedNodeIterator.Load(command.Execute()); // Load all nodes for preventing to close container before finish query
        }
    }
}
